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Chemistry of Life Week 2 notes

by: Samantha Weller

Chemistry of Life Week 2 notes CHEM 120 - 04

Marketplace > Radford University > Chemistry > CHEM 120 - 04 > Chemistry of Life Week 2 notes
Samantha Weller
GPA 3.2
Chemistry of Life
Lissa F Huston

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About this Document

This is one week of notes of Chemistry of Life. This week, we finished chapter 2 and went on to Chapter 3: Matter and Energy.
Chemistry of Life
Lissa F Huston
Class Notes
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This 5 page Class Notes was uploaded by Samantha Weller on Friday September 11, 2015. The Class Notes belongs to CHEM 120 - 04 at Radford University taught by Lissa F Huston in Summer 2015. Since its upload, it has received 53 views. For similar materials see Chemistry of Life in Chemistry at Radford University.


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Date Created: 09/11/15
Chemistry of Life Week 2 Notes CHAPTER 2 CONTINUED Conversion factor the set of parentheses where the top and bottom are equal Two Rules 1 Top and bottom of a conversion factor must be equal or equivalent 2 Units MUST cancel Writing Conversion factors Suppose you need to convert 2 pints to mL we know that there are 473 mL in a pint 473 mL 1 pint 473 mL 473 mL 2pt 9 6 mL 1 pt cancels out the pt in the rst number Another example A nurse wants to administer morphine to a 9year old boy He weighs 62 lbs and the dose is listed as 200 mg per kg of body weight The medication contains 20 mg in every 10 mL How many milliliters should be injected 1 kg 22 lb 62l b 1kg 020mg 10 mL 28 mL Goal is to cancel out the numbers 22 He 1 kg 20 mg Or if you want to do it backwards mL mL mg Kg lb mg Kg lb Dens y the mass per unit volume Mass M D or 1cmquot3 1 mL vmume V Common Units for Density gcmquot3 for Solids gmL for liquids gL for gases if you know any 2 of the 3 variables you can solve for the 3rd The mass of an object is 452 g and a volume of 192 cmquot3 What is the density 0235 gcmquot3 D 192 cmquot3 the mass of an object 230 g density is 900 gcmquot3 What is the volume 0900 gcmquot3 2309 07900gcmA3 CROSS MULTIPLY x X 97999 0900 John took 20 tsp of cough syrup If the syrup had a density of 120 gmL and there is 50 mL in 1 tsp what is the mass in of the cough syrup 20tsp 50ml 120g gtllt Chapter 3 Matter and Energy anything that has mass and takes up space 3 states of Matter has a de nite shape and a de nite volume has inde nite shape and inde nite volume has inde nite shape and inde nite volume Classi cation of Matter matter with distinct properties and a composition that does not vary from sample to sample substance that cannot be decomposed into simpler substances elements are made up of unique atoms combination of two or more substances in which each substance retains it39s chemical identity can be separated by physical processes Mixtures have variable composition 0 do not have uniform composition properties or appearance 0 Ex chocolate chips ice cream sand 0 uniform throughout Also called Solutions 0 Ex Atmosphere 02 N2 C02 H20 0 Beer H20 C2 H50H and more Mixture Separations Filtration remove solid from liquid Chromatography different compounds of a liquid separate as they move at different rates up the surface of a pierce of chromatography paper Distillation separate 2 liquids by boiling point Classify Carbon Element Air with clouds Heterogeneous Seawater homogeneous Neon element 0 Granite Heterogeneous Sand heterogeneous Brass Heterogeneous Sugar Compound Methane Homogeneous Fruit salad Heterogeneous Salt Compound Patinum Element Twix heterogeneous Classi cation of Matter transformation of a sample of matter that does not alter the chemical identities of any of the substances in the sample ex melting boiling reaction transformation of a sample of matter in which the chemical identity of the substances changes ex rusting digesting Properties of Matter are observed without changing a substance into another substance a substances state size or appearance changes but the composition remains the same can only be observed when a a substances state size appearance Temperature Heat and Energy the measure of the amount of heat energy in an object Energy the ability to do work Using forced to move an object across a distance 2 types of energy energy of motion Stored energy determined by the position of the object or by the chemical composition of a substance associated with the movement of particles The SI unit of energy is the joule J it is a very small amount of energy so scientists often use kilojoules kJ Jkgmquot2Squot2 1kJ 1000 Calorie The amount of energy needed to raise the temperature of 1 gram of water 1 degree Calcius cal Food calorie Cal 1 Cal 1000 cal 1 cal 4184 Energy values for food are the kilocalories or kilojoules obtained from burning 1g of carbs fat or protein Carbs 4 cal fat 9 cal protein 4 cal Speci c Heat the amount of heat needed to raise the temperature of 1 gram of a substance by 1 degree Celsius Units Jg degree Celcius Speci c Heat of H20 is 4184 Jg degree Celcius Heat mass speci c heat temperature change


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